David "Dai" Rees Prosser (13 October 1912 – 6 May 1973 (aged 60)) born in Neath, was a Welsh dual-code international rugby union and professional rugby league footballer of the 1930s and '40s, and rugby league coach of the 1960s, playing representative level rugby union (RU) for Wales, and Glamorgan County RFC, and at club level for Glynneath RFC, Neath RFC, and Swansea RFC, as a Prop forward, i.e.